Question 1. We know that. Find the velocity of the satellite at apogee and perigee. (d) more. NCERT Solutions for Class 11 Physics Chapter 8 Gravitation are part of Class 11 Physics NCERT Solutions. Give reason for your answer. (b) we will become hotter after billions of years. A star 2.5 times the mass of the sun and collapsed to a size of 12 km rotates with a speed of 1.2 rev. Initial potential energy at the surface of earth = GMem/’r. Answer: Here G = 6.67 x 10-11 Nm2 kg-2; M = 100 kg; R = 0.1 m, distance between the two spheres, d = 1.0 m The upward force exerted by the liquid displaced by the body when it is placed inside the liquid is called (a) Gravitational force (b) Force of gravitation (c) Buoyant force (d) Centripetal force Answer. MCQ Questions for Class 9 Science: Ch 10 Gravitation. of space ship is zero, therefore. (d) The formula – GMm (1/r2-1/r1) is more/less accurate than the formula mg (r2 – r1) for the difference of potential energy between two points r2 and r1 distance away from the centre of the Earth. The radius of the earth is 6400 km and g = 10 m/s². Our mission is to provide a free, world-class education to anyone, anywhere. The term gravity is used for gravitation, but gravitation is defined as the theory that explains the attraction while gravity is defined as the force that pulls objects towards each other. (a) Calculate height of such a satellite. Question 8. Assertion and Reason. Gravitation is important from the perspective of scoring high in IIT JEE, AIEEE and other engineering examination as the questions based on them are direct and do not have much twist and turns. Suppose there existed a planet that went around the Sun twice as fast as the Earth. Find eccentricity of the orbit. Here we have covered Important Questions on Gravitation for Class 11 Physics subject.. Physics Important Questions Class 11 are given below.. These important questions of gravitation will play significant role in clearing concepts of Physics class 11 as well as in revision of 12th students. mass of the Earth = 6 x 10^24 Kg G = 6.67 x 10^(-11) N-m^2/kg^2 and distance between the Sun and the Earth=1.49 x 10^11 m) Physics Notes Class 11 CHAPTER 8 GRAVITATION Every object in the universe attracts every other object with a force which is called the force of gravitation. = 6400 + 36000 = 42400 km = 4.24 x 107 m. Question 8. 12. R = 1.5 x 108 km = 1.5 x 1011 m In the following two exercises, choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig.) per second. Does the comet have a constant (a) linear speed (b) angular speed (c) angular momentum (d) kinetic energy (e) potential energy (f) total energy throughout its orbit? There are around 3-5 solved test papers in each chapter. Contents. The variation in g can also be detected. Suppose that the distance of either sphere from the mid-point of the line joining their centre is r. Then r=d/2=0.5 m. The gravitational field at the mid-point due to two spheres will be equal and opposite. At distance r from centre of earth, kinetic energy becomes zero question_answer 11) According to Newton's law of gravitation, the apple and the earth experience equal and opposite forces due to gravitation. 18. Question 8. Here we have given NCERT Solutions for Class 11 Physics Chapter 8 Gravitation. Register online for Physics tuition on Vedantu.com to score more marks in your Examination. Before starting with Gravitation Class 11, it is crucial to understand that gravity and gravitation are not similar. This energy changes into potential energy. (a) the solar cells and batteries in satellites run out. Answer: Using the explanation given in the solution of the previous problem, the direction of the gravitational field intensity at P will be along e. So, option (ii) is correct. 23. Class 11 Physics Gravitation have diffent set of questions. If the space station orbiting around the earth has a large size, can he hope to detect gravity? Does the escape speed of a body from the Earth depend on (a) the mass of the body, (b) the location from where it is projected, (c) the direction of projection, (d) the height of the location from where the body is launched? How far from the earth does the rocket go before returning to the earth? Gravitation Class 11 MCQs Questions with Answers. Answer: Question 8. The notes contain solution of all the numerical given in the chapter. Mass of the earth = 6.0 x 1024 kg; mean radius of the earth = 6.4 x 106 m; G = 6.67 x 10-11 N m2 kg-2. (b) Yes. The value of G is 6.67 X 10-11 Nm 2 kg-2 and is same throughout the universe. NCERT Solutions; _Class 6; _Class 7; _Class 8; _Class 9; _Class 10; __NCERT Solutions for Class 10 Maths; _Class 11; ... 11. Mass of the sun = 2 x 1030 kg, mass of the earth = 6 x 1024 kg. Topics and Subtopics in NCERT Solutions for Class 11 Physics Chapter 8 Gravitation: NCERT Solutions Class 11 PhysicsPhysics Sample Papers. Let the body have mass m. Question 8. Question 8. b. Does this explain variation of length of the day during the year? You also get idea about the type of questions and method to answer in your Class 11th examination. (b) A geostationary satellite goes around the earth in east-west direction. Assume the stars to remain undistorted until they collide. If the law of gravitation, instead of being inverse-square law, becomes an inverse-cube law-. of the stars = 1/2Mv2 + 1/2Mv2 (a) will be directed towards the centre but not the same everywhere. ) will move in orbits like planets and obey Kepler ’ s pull is than. 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